大气科学学报2018，Vol.41Issue(2)：167-175,9.DOI:10.13878/j.cnki.dqkxxb.20170210004
非ENSO年夏季西风带波包活动特征及其对长江中下游强降水事件的影响:以1993年为例
Characteristics of Rossby wave packets in non-ENSO years and their possible impacts on severe precipitation events in the middle and lower reaches of Yangtze River in summer:A glimpse in 1993
摘要
Abstract
Using SST data from Hadley Centre,the NCEP/NCAR reanalysis data along with 740-station precipitation data in China,combined with the lag correlation and other methods,this paper analyzes the characteristics of summer precipitation in the Yangtze River Basin in non-ENSO years and investigates the characteristics of Rossby wave packets and their possible impacts on summer severe precipitation events in the Yangtze River Basin in nonENSO year 1993.Results show that there exist strong interannual and interdecadal variations for summer precipitation in the middle and lower reaches of the Yangtze River in non-ENSO years.Among non-ENSO years,1993 is a special year when the strongest flooding occurred in the Yangtze River Basin,which is chosen as the case for study.It is found that the wave packets in 1993 are originated from the south of Caspian Sea,propagating eastward to the middle and lower reaches of the Yangtze River.These wave packets disperse energy eastward,inducing accumulation of energy over China,facilitating the occurrence of summer severe precipitation in the Yangtze River Basin.A comparison is made for non-ENSO year 1993 and ENSO year 1983.It is found that the route along which the wave packets propagate in non-ENSO year 1993 locates more southern than that in ENSO year 1983.These results are helpful for us to understand the forming mechanism of summer severe rainfall events in the Yangtze River Basin in non-ENSO years.关键词
非ENSO年/长江中下游/夏季降水/斜压波包Key words
non-ENSO years/middle and lower reaches of Yangtze River/summer precipitation/baroclinic Rossby wave packet引用本文复制引用
李鑫,管兆勇,叶德超..非ENSO年夏季西风带波包活动特征及其对长江中下游强降水事件的影响:以1993年为例[J].大气科学学报,2018,41(2):167-175,9.基金项目
公益性行业(气象)科研专项(GYHY201406024) （气象）
灾害天气国家重点实验室课题(2015LASW-A03) （2015LASW-A03）
江苏高校优势学科建设工程资助项目(PAPD) （PAPD）
